<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        for (var o of arr) {
            console.log(o);
        }
        let obj = {
            name: 'document',
            age: 3000,
            sex: 'male'
        };
        for (var k of obj) {
            console.log(k); //对象不能用forof结构
        }
    </script>
</body>

</html>